fix cerebras llama-3.1-70b model_prices_and_context_window, not llama3.1-70b

[xsg22]

Title

Relevant issues

Pre-Submission checklist

Please complete all items before asking a LiteLLM maintainer to review your PR

• I have Added testing in the tests/litellm/ directory, Adding at least 1 test is a hard requirement - see details
• I have added a screenshot of my new test passing locally
• My PR passes all unit tests on make test-unit
• My PR's scope is as isolated as possible, it only solves 1 specific problem

Type

🆕 New Feature
🐛 Bug Fix
🧹 Refactoring
📖 Documentation
🚄 Infrastructure
✅ Test

Changes

[vercel]

The latest updates on your projects. Learn more about Vercel for Git ↗︎

Name	Status	Preview	Comments	Updated (UTC)
litellm	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	May 8, 2025 2:56am

[CLAassistant]

Thank you for your submission! We really appreciate it. Like many open source projects, we ask that you sign our Contributor License Agreement before we can accept your contribution.
_{You have signed the CLA already but the status is still pending? Let us recheck it.}

[xsg22]

This is the model name cited in the official document: https://inference-docs.cerebras.ai/api-reference/models

and, this is the name of the model in the return response of the interface:

{
    "id": "chatcmpl-79d79bbf-20e2-4f61-87e4-b97bcf2c8fdf",
    "choices": [
        {
            "finish_reason": "stop",
            "index": 0,
            "message": {
                "content": "[{\"content\": \"Yes, please switch off narrative power to.\"}]",
                "role": "assistant"
            }
        }
    ],
    "created": 1746672738,
    "model": "llama-3.3-70b",
    "system_fingerprint": "fp_c1b1963fdfa747d6bac1",
    "object": "chat.completion",
    "usage": {
        "prompt_tokens": 521,
        "completion_tokens": 16,
        "total_tokens": 537
    },
    "time_info": {
        "queue_time": 0.001188902,
        "prompt_time": 0.011535164,
        "completion_time": 0.012524334,
        "total_time": 0.02724003791809082,
        "created": 1746672738
    }
}